Boris Becker was spotted with a huge growth the size of a tennis ball on his elbow while captaining Germany at the inaugural ATP Cup.
The four-time Wimbledon champion, 52, is currently in Australia captaining Team Germany.
The German legend, who won his first title at Wimbeldon aged just 17, has long struggled with the injury.
Interestingly, though, Becker’s bump is NOT thought to be tennis elbow.
The lump on the joint is actually visible on both elbows, with the left arm – his non-playing side – arguably the worse of the two.
It’s thought Becker actually suffers from “student’s elbow” – with pressure on the elbow from leaning on a desk the general cause.
Five years ago, the former world No1 showed off the nasty-looking injury while acting as Novak Djokovic’s coach at the US Open.
The Times’ medical correspondent, Dr Mark Porter, revealed: “It’s a good [case of student’s elbow].
“They are often the size of a golf ball but looking at it, this one is, appropriately, the size of a tennis ball.”
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But Becker’s focus was elsewhere on Friday, as superstar German Alexander Zverev lost his temper and smashed his racket during the tie with Australia.
The world No7 unfurled seven double faults against Alex De Minaur in front of a raucous host crowd in Brisbane.